DISCREPANCIES OF DIGITAL IMPRESSIONS OF FULL-COVERAGE MOLAR PREPARATIONS OBTAINED WITH DIFFERENT INTRAORAL SCANNER TIP SIZES

Abstract

The purpose of this study was to evaluate the accuracy of intraoral scanner tip size on the discrepancies of digital impressions of a full-coverage molar preparation by means of trueness value. This in vitro experimental study compared digital impressions obtained with a Medit i700 intraoral scanner using two tip sizes: normal tip and small tip. A standardized full-coverage preparation on a maxillary second molar typodont tooth was used as the master model. Reference data were acquired with a laboratory scanner, and the scan datasets were superimposed onto the reference model using 3D analysis software. Discrepancies were quantitatively assessed by root mean square (RMS) deviation values and qualitatively evaluated with color-coded deviation maps. The results of this study are expected to clarify whether scanner tip size affects scan trueness in posterior full-coverage preparations and to provide useful information for scanner tip selection and optimization of digital impression procedures in prosthodontic practice.

Keywords: Medit I700, Scanner Tip Size, Intraoral Scanner, Digital Impression, 3D Deviation Analysis